TSFMag Tide and Solunar Chart
Dear Jim D: R. A. Knight's theory puts forth...minor feed periods coincide with the moon on the horizon, lasting 1.0 to 1.5 hours following moon rise and before moon set. Major feeding periods 1.0 to 1.5 hours either side of the moon being directly overhead or directly underfoot. The use of minor and major nomenclature in no way implies the intensity of the feeding activity, it relates only to the duration.
Using Mike McBride's idea, we had a custom software created to project feeding times on a daily basis for the full calendar year using NOAA's standard sunrise/sunset/moon rise/moon set and moon phase data. The program is based upon local time CST or DST (whichever applies) at longtitude Houston, TX. While this would indicate that Sabine would in actuality be a few minutes earlier than the scheduled time and Matagorda, POC, Corpus, Port Isabel etc. would each happen a few minutes progressively later as longtidue varies, the feed times are difficult to assess to such a finite degree. I have noticed that depending local atmospheric and water conditions the feeding periods may occur anywhere from right-on-time to thirty minutes late - and not happen at all.
As for the size/legibility of the words on the page...they are what they are...sorry!
As you have noted here as well as other's comments on previous posts, there is a surprising variation of feeding times published in solunar tables. Ditto tide charts. In the interest of accuracy we built-in the CST/DST compensator and use strictly NOAA tide and sun/moon data.
In addition to variations in solunar data, one thing that always puzzled me was tide correction factors where the Galveston Channel tide was the basis for predicting events at Pass Cavallo, Port Aransas, etc., etc. Somehow adding or subtracting a certain number of minutes or even hours never enabled me to matriculate two tides into three or three into four. I think the greatest error I ever witnessed was one Texas regional magazine that advertised the full moon to occur two days later than the actual event (according to NOAA.)
Last edited by EJ@TSFMag; 10-03-2011 at 04:03 PM.